EP0962915A1 - Verfahren und Gerät zur Steuerung des Betätigers einer Plattenspeicherungseinheit - Google Patents

Verfahren und Gerät zur Steuerung des Betätigers einer Plattenspeicherungseinheit Download PDF

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Publication number
EP0962915A1
EP0962915A1 EP98123219A EP98123219A EP0962915A1 EP 0962915 A1 EP0962915 A1 EP 0962915A1 EP 98123219 A EP98123219 A EP 98123219A EP 98123219 A EP98123219 A EP 98123219A EP 0962915 A1 EP0962915 A1 EP 0962915A1
Authority
EP
European Patent Office
Prior art keywords
pwm
storage disk
drive
actuator
servo
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98123219A
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English (en)
French (fr)
Other versions
EP0962915B1 (de
Inventor
Tomoaki Fujitsu Limited Saito
Tatsuya Fujitsu Limited Gofuku
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
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Fujitsu Ltd
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Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of EP0962915A1 publication Critical patent/EP0962915A1/de
Application granted granted Critical
Publication of EP0962915B1 publication Critical patent/EP0962915B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/022—H-Bridge head driver circuit, the "H" configuration allowing to inverse the current direction in the head
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
    • G11B5/553—Details
    • G11B5/5547—"Seek" control and circuits therefor

Definitions

  • the present invention relates to an actuator driving method and an actuator driving apparatus for driving an actuator for moving a head and, more particularly, to an actuator driving method and an actuator driving appatatus for PWM-driving the actuator in a storage disk device for reading or reading/writing information from a storage disk by the head.
  • a storage disk device such as a magnetic disk device etc has been widely utilized as a storage device of a computer etc.
  • a high-density record and a decrease in the electric power consumed are demanded of this type of storage disk device.
  • a PWM driving system is applied to a driving stage of the actuator (VCM).
  • FIG. 5 is a diagram showing a construction of the prior art.
  • FIG. 6 is an explanatory diagram of the prior art.
  • the magnetic disk device includes a magnetic disk 101 and a magnetic head 90.
  • a servo signal is recorded per sector on the magnetic disk 101.
  • the magnetic head 90 reads and writes the information from and to the magnetic disk 101.
  • the head IC 91 amplifies the signal read by the magnetic head 90.
  • a read channel IC 92 selects a read signal transmitted from the head IC.
  • a servo signal demodulator 93 demodulates a servo signal from the read channel IC 92 into a position signal.
  • a servo gate generation circuit 94 generates, synchronizing with rotations of the magnetic disk 101, a servo gate signal indicating that the magnetic head 90 is located in a servo region recorded with the servo signal of the magnetic disk 101.
  • a control circuit 95 detects a present position of the head in accordance with the position signal, and generates a current indication value corresponding to a distance from a position to be sought.
  • a digital/analog converter 96 converts the current indication value given from the control circuit 95 into an analog quantity.
  • a PWM (Pulse Width Modulation) driver 97 generates a drive current having a pulse width corresponding to the current indication value.
  • a linear driver 98 generates a drive current of which a magnitude corresponds to the current indication value.
  • a coil driving circuit 99 has four power transistors Q1 - Q4.
  • a coil VCM of the actuator is connected to the four power transistors Q1 - Q4.
  • a current detection resistor RS detects an electric current flowing to the coil VCM.
  • a differential amplifier 100 generates an interterminal voltage of the current detection resistor RS, and feeds back this voltage to the PWM driver 97 and the linear driver 98.
  • An inverting circuit 102 inverts a PWM enable signal and outputs the inverted signal to the linear driver 98.
  • control circuit 95 detects the present position from the servo information during seek control (coarse control), and generates the current indication value corresponding to a distance at which a seek movement is made. Further, the control circuit 95 obtains a deviation from the center of the tracks from the servo information and generates the current indication value for the duration of an on-track (fine control) operation.
  • the PWM enable signal is set high, and the PWM driver 97 is operated.
  • the PWM driver 97 thereby generates the drive current having the pulse width corresponding to the current indication value. Therefore, the coil VCM of the actuator is PWM-driven.
  • the PWM drive makes the driving pulse width change, and hence the electric power consumed can be largely reduced.
  • the PWM enable signal is set low, while the operation of the PWM driver 97 is inhibited. With this inhibition, the linear driver 98 is operated by an inverted signal of the PWM enable signal.
  • the linear driver 98 thereby generates the drive current of which a magnitude corresponds to the current indication value. Therefore, the coil VCM of the actuator is linearly driven. During this on-track operation, the current indication value defined as a control quantity is small, and hence, even when linearly driven, the electric power consumed is small.
  • the PWM drive with the small amount of electric power consumed is carried out during the seek operation, thereby restraining the consumption of the electric power of the disk device.
  • the servo information be read during also the seek control. If switching of the drive current of the actuator VCM is effected during the read operation of the servo information, the servo signal is overlapped with the switching noises thereof. Hence, this leads to such a problem that the precise servo signal can not be obtained.
  • the servo signal when enhancing the recording density, the servo signal might become weak against the noises, and the precise servo signal is hard to obtained.
  • a storage disk apparatus comprises a storage disk, a head for reading information from the storage disk, a PWM driver for generating a drive current having a pulse width corresponding to a current indication value, a linear driver for generating a drive current of which a magnitude corresponds to the current indication value, an actuator, driven by the drive current, for moving the head, and a control circuit for generating the current indication value for positioning the head from the servo information read from the storage disk by the head.
  • An actuator driving method thereof comprises a step of PWM-driving the actuator by the PWM driver, and a step of effecting a switchover from the PWM drive to a linear drive by the linear driver during a period for which the control circuit reads the servo information during the PWM drive.
  • the PWM drive is halted during the period for which the control circuit reads the servo information. It is therefore feasible to prevent the servo information from being overlapped with switching noises due to the PWM drive.
  • the linear drive is conducted. Hence, the seek velocity can be prevented from decreasing even when stopping the PWM drive.
  • the PWM drive step comprises a step of applying the current indication value and selecting the PWM drive.
  • the actuator driving method further comprises a step of detecting from the servo information that the head arrives at the vicinity of a target position, and executing the switchover from the PWM drive to the linear drive.
  • the switchover step comprises a step of selecting the linear drive in accordance with a servo gate signal indicating that the head is located in a servo information write region on the storage disk.
  • the switchover step comprises a step of selecting an output of the linear driver in accordance with AND of the servo gate signal and a PWM enable signal for operating the PWM driver.
  • FIG. 1 is a diagram showing a construction in one embodiment of the present invention.
  • FIGS. 2A and 2B are explanatory diagrams of a servo gate signal.
  • a magnetic disk apparatus includes a magnetic disk 1 and a magnetic head 2.
  • the magnetic disk 1 has a data surface on which servo signals are embedded in data tracks.
  • data regions 15 and servo regions 16 are disposed alternately. The servo regions are recorded with the servo signals.
  • the magnetic head 2 reads and writes information from and to the magnetic disk 1.
  • a head IC 3 amplifies the signal read by the magnetic head 2.
  • a read channel IC 4 selects the read signal from the head IC 3.
  • a servo signal demodulator 5 demodulates the servo signal from the read channel IC 4 into a position signal.
  • a servo gate generation circuit 6 generates a servo gate signal, synchronizing with rotations of the magnetic disk 1. As shown in FIG. 2B, a servo gate signal "Servo Gate” assumes a low level when the magnetic head 2 is located in the servo region on the magnetic disk 1.
  • a control circuit 7 is constructed of a processor.
  • the control circuit 7 reads a position signal in accordance with the servo gate signal. Then, the control circuit 7 detects a present position of the head from the position signal, and generates a current indication value corresponding to a distance to a target position from the present position.
  • a digital/analog converter 8 converts the current indication value given from the control circuit 7 into an analog quantity.
  • a PWM (Pulse Width Modulation) driver 9 becomes operable when a PWM enable signal from the control circuit 7 is at a high level, and outputs driving current for PWM-driving a coil edge voltage in accordance with the current indication value given from the D/A converter 8.
  • a linear driver 10 always operates and outputs a driving current of which a magnitude corresponds to the current indication value given from the D/A converter 8.
  • An AND gate 11 takes AND of the servo gate signal and the PWM enable signal, and generates a switchover signal SW.
  • a coil driving circuit 12 includes four power transistors Q1 - Q4.
  • a coil VCM of the actuator is connected to mid-points of the four power transistors Q1 - Q4.
  • a current detection resistor RS detects an electric current flowing to the coil VCM.
  • a differential amplifier 13 generates an inter-terminal voltage of the current detection resistor RS, and feeds back this voltage to the PWM driver 9 and the linear driver 10 as well.
  • a switch 14 has a contact point P for an output of the PWM driver 9, a contact point L for an output of the linear driver 10, and a movable contact point T connected to each of the power transistors Q1 - Q4. Then, the movable contact point T is connected to the contact point P or L in accordance with the switchover signal SW. The output of the PWM driver 9 or of the linear driver 10 is thereby selected corresponding to the switchover signal SW. Note that the switch 14 is classified as an analog switch.
  • FIG. 3 is a flowchart showing a control process in one embodiment of the present invention.
  • FIG. 4 is a diagram showing a waveform in one embodiment of the present invention.
  • the PWM drive is effected during the coarse control. Therefore, the electric power consumed can be largely reduced.
  • PWM drive is halted and the drive is switched over to the linear drive during the period that the control circuit read the servo signal. Hence, the switching noises due to the PWM drive can be prevented from entering the servo signal to be read. Besides, because of being linearly driven, the seek velocity can be prevented from decreasing.
  • the control circuit 7 after a predetermined time has elapsed since the beginning of the low-level period of the servo gate signal SVG, reads the servo signal during the low-level period of the servo gate signal SVG. Hence, the control circuit 7 is capable of reading the servo signal containing no noises. Accordingly, even when the PWM drive is carried out, the seek control can be precisely executed.
  • control circuit 7 after the predetermined time has elapsed since the beginning the low-level period of the servo gate signal SVG, reads the servo signal, and is therefore, even when providing the output stages of the drivers 9, 10 with the switches 14, capable of steering clear of the servo signal containing the noises due to this switching operation.

Landscapes

  • Moving Of Head For Track Selection And Changing (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Control Of Linear Motors (AREA)
EP98123219A 1998-06-02 1998-12-06 Verfahren und Gerät zur Steuerung des Betätigers einer Plattenspeicherungseinheit Expired - Lifetime EP0962915B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP15270298 1998-06-02
JP10152702A JPH11353830A (ja) 1998-06-02 1998-06-02 記憶ディスク装置のアクチュエータ駆動方法及びその装置

Publications (2)

Publication Number Publication Date
EP0962915A1 true EP0962915A1 (de) 1999-12-08
EP0962915B1 EP0962915B1 (de) 2008-07-02

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EP98123219A Expired - Lifetime EP0962915B1 (de) 1998-06-02 1998-12-06 Verfahren und Gerät zur Steuerung des Betätigers einer Plattenspeicherungseinheit

Country Status (4)

Country Link
US (1) US6501609B2 (de)
EP (1) EP0962915B1 (de)
JP (1) JPH11353830A (de)
DE (1) DE69839665D1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1339163A1 (de) * 2002-02-19 2003-08-27 STMicroelectronics S.r.l. Lineare PWM-Regelung für eine elektromagnetische Last
EP1367704A2 (de) * 2002-05-29 2003-12-03 Texas Instruments Incorporated Modulationsart für Schaltverstärker zur Verminderung der Filterungsanforderung und der Ubergangsverzerrung
US7436616B2 (en) 2006-05-31 2008-10-14 Toshiba Corporation Current pulsing for unloading
US7440224B2 (en) 2006-01-23 2008-10-21 Toshiba Corporation Disk drive servo
CN102828983A (zh) * 2012-09-28 2012-12-19 江苏省电力公司常州供电公司 风机冷却控制装置及其工作方法
CN102840160A (zh) * 2012-09-28 2012-12-26 江苏省电力公司常州供电公司 风冷控制装置及其工作方法
CN105041699A (zh) * 2012-12-13 2015-11-11 蒋红娟 适于控制钛风机转速的控制装置及其工作方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4265877B2 (ja) * 2001-05-30 2009-05-20 株式会社ルネサステクノロジ 磁気ディスク記憶装置
JP3871200B2 (ja) * 2001-05-30 2007-01-24 株式会社ルネサステクノロジ 磁気ディスク記憶装置
JP2004178670A (ja) * 2002-11-26 2004-06-24 Hitachi Ltd ディスク記憶装置
JP2005051852A (ja) * 2003-07-30 2005-02-24 Sanyo Electric Co Ltd モータ駆動回路、集積回路、モータ回路の駆動方法
US6989955B2 (en) * 2004-05-28 2006-01-24 Texas Instruments Incorporated Efficient transition from class D to linear operation in dual-mode voice coil motor controllers
JP5559675B2 (ja) 2010-12-28 2014-07-23 パナソニック株式会社 アクチュエータ駆動装置
CN105162130A (zh) * 2012-12-13 2015-12-16 蒋红娟 一种钛风机
US9906181B2 (en) 2015-04-23 2018-02-27 Samsung Electro-Mechanics Co., Ltd. Voice coil motor driver and camera module having the same
US11940827B1 (en) * 2022-12-09 2024-03-26 Cirrus Logic International Semiconductor Ltd. Management of path selection in a multi-path control system

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US3665500A (en) * 1970-04-01 1972-05-23 Sli Ind Variable mode feedback control system
JPH04161081A (ja) * 1990-10-24 1992-06-04 Nec Corp スピンドルモータ駆動回路
EP0584855A1 (de) * 1992-08-18 1994-03-02 International Business Machines Corporation Spindelsteuerungsverfahren- und Gerät für Plattenantrieb
WO1997041558A1 (en) * 1996-04-30 1997-11-06 Quantum Corporation Pwm/linear driver for disk drive voice coil actuator

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JP2705218B2 (ja) 1989-06-06 1998-01-28 ソニー株式会社 光ディスク記録再生装置のシーク方式
US5731670A (en) * 1995-03-31 1998-03-24 Sgs-Thomson Microelectronics S.R.L. Method for driving a brushless DC electric motor
US5986426A (en) * 1997-08-05 1999-11-16 International Business Machines Corporation Adaptive pulse width modulated motor control

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Publication number Priority date Publication date Assignee Title
US3665500A (en) * 1970-04-01 1972-05-23 Sli Ind Variable mode feedback control system
JPH04161081A (ja) * 1990-10-24 1992-06-04 Nec Corp スピンドルモータ駆動回路
EP0584855A1 (de) * 1992-08-18 1994-03-02 International Business Machines Corporation Spindelsteuerungsverfahren- und Gerät für Plattenantrieb
WO1997041558A1 (en) * 1996-04-30 1997-11-06 Quantum Corporation Pwm/linear driver for disk drive voice coil actuator

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1339163A1 (de) * 2002-02-19 2003-08-27 STMicroelectronics S.r.l. Lineare PWM-Regelung für eine elektromagnetische Last
US6804131B2 (en) 2002-02-19 2004-10-12 Stmicroelectronics S.R.L. PWM/linear driver for an electromagnetic load
EP1367704A2 (de) * 2002-05-29 2003-12-03 Texas Instruments Incorporated Modulationsart für Schaltverstärker zur Verminderung der Filterungsanforderung und der Ubergangsverzerrung
EP1367704A3 (de) * 2002-05-29 2006-02-01 Texas Instruments Incorporated Modulationsart für Schaltverstärker zur Verminderung der Filterungsanforderung und der Ubergangsverzerrung
US7440224B2 (en) 2006-01-23 2008-10-21 Toshiba Corporation Disk drive servo
US7436616B2 (en) 2006-05-31 2008-10-14 Toshiba Corporation Current pulsing for unloading
CN102840160B (zh) * 2012-09-28 2014-12-24 江苏省电力公司常州供电公司 风冷控制装置及其工作方法
CN102840160A (zh) * 2012-09-28 2012-12-26 江苏省电力公司常州供电公司 风冷控制装置及其工作方法
CN102828983A (zh) * 2012-09-28 2012-12-19 江苏省电力公司常州供电公司 风机冷却控制装置及其工作方法
CN102828983B (zh) * 2012-09-28 2016-01-13 江苏省电力公司常州供电公司 风机冷却控制装置及其工作方法
CN105402152A (zh) * 2012-09-28 2016-03-16 江苏省电力公司常州供电公司 一种用于风机冷却控制的装置
CN105402151A (zh) * 2012-09-28 2016-03-16 江苏省电力公司常州供电公司 一种风冷控制装置
CN105402150A (zh) * 2012-09-28 2016-03-16 江苏省电力公司常州供电公司 风冷控制装置
CN105041699A (zh) * 2012-12-13 2015-11-11 蒋红娟 适于控制钛风机转速的控制装置及其工作方法
CN105041698A (zh) * 2012-12-13 2015-11-11 蒋红娟 适于控制钛风机转速的控制装置
CN105020163B (zh) * 2012-12-13 2017-02-08 林乐宗 适于控制钛风机转速的控制装置及其工作方法

Also Published As

Publication number Publication date
DE69839665D1 (de) 2008-08-14
US20010043429A1 (en) 2001-11-22
JPH11353830A (ja) 1999-12-24
EP0962915B1 (de) 2008-07-02
US6501609B2 (en) 2002-12-31

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